package com.anjiplus.template.gaea.business.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Created by raodeming on 2021/4/29.
 */
public class DateUtil {

	private static String defaultDatePattern = "yyyy-MM-dd";

	private static String defaultDateTimePattern = "yyyy-MM-dd HH:mm:ss.SSS";

	private static String defaultyyyyMMddPattern = "yyyyMMdd";

	private static String defaultYmdHmsPattern = "yyyy-MM-dd HH:mm:ss";

	private static String defaultHmsPattern = "HH:mm:ss";

	/**
	 * 字符串yyyy-MM-dd HH:mm:ss转日期
	 * @param dateStr yyyy-MM-dd HH:mm:ss
	 * @return
	 */
	public static Date parseHmsTime(String dateStr) {
		return parse(dateStr, defaultYmdHmsPattern);
	}

	/**
	 * 字符串转日期
	 * @param dateStr
	 * @param pattern
	 * @return
	 */
	public static Date parse(String dateStr, String pattern) {
		SimpleDateFormat sdf = new SimpleDateFormat(pattern);
		if (dateStr == null || "".equals(dateStr)) {
			return null;
		}
		try {
			Date d = sdf.parse(dateStr);
			return d;
		}
		catch (ParseException e) {
			System.out.println("日期转换错误: " + e.getMessage());
			return null;
		}
	}

	/**
	 * 获取未来第几天的日期
	 * @param day
	 * @return
	 */
	public static Date getFutureDateTmdHms(int day) {
		if (day <= 0) {
			// 默认2099年
			return parse("2099-01-01", defaultDatePattern);
		}
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) + day);
		return calendar.getTime();
	}

	/**
	 * 未来时间 根据指定时间获取
	 * @param time
	 * @param day
	 * @return
	 */
	public static Date getFutureDateTmdHmsByTime(Date time, int day) {
		if (day <= 0) {
			// 默认2099年
			return parse("2099-01-01", defaultDatePattern);
		}
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(time);
		calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) + day);
		return calendar.getTime();
	}

	public static void main(String[] args) {
		Date futureDateTmdHms = getFutureDateTmdHms(7);
		System.out.println(futureDateTmdHms);
	}

}
